Embioptera (webspinners): silk-producing insects of the tropics and subtropics

Key characteristics

• Silk production: Silk glands are housed in the tarsal segments of the forelegs; individuals spin tubes and galleries of silk for shelter and movement.
• Sexual dimorphism: Adult males are often winged and short-lived, while females typically remain wingless and more robust.
• Diet and habitat: Most feed on detritus such as leaf litter, moss, algae, lichen and fungal films on bark.
• Behavior: Many species live gregariously within silk galleries that can cover bark, stones or leaf litter.

Behavior and ecology

Webspinners construct and maintain extensive networks of silk galleries which serve several functions: protection from predators and desiccation, microclimate control, and a foraging arena. Their lifestyle is largely nocturnal; they move through their silk tunnels to find food and may repair or extend galleries continuously. Some species show maternal care, with females guarding eggs and young nymphs for a period after hatching.

History and evolution

Fossil remains and specimens preserved in amber indicate that embiopterans have an ancient origin, with representatives known from the Jurassic and a strong presence in Cretaceous amber. Their long fossil history shows that the silk-producing habit is an established and successful adaptation. Modern taxonomic treatments place them as a separate order, Embioptera, recognized for its unique morphology and behavior.

Human interactions and distribution

Although primarily tropical, some species appear occasionally in temperate regions, usually as accidental stowaways on transported goods or plant material. Trade and cargo movements have been implicated in such introductions; specimens and live individuals are sometimes carried in shipping containers or agricultural shipments (cargo transport). Webspinners are not pests in the usual sense, but their presence can be a curiosity or a concern when they arrive outside their native range.

Notable facts and distinctions

Compared with other silk-producing arthropods, embiopteran silk is produced from the legs rather than abdominal glands. The order remains relatively small in terms of species diversity and is often overlooked because of its cryptic habits. For researchers, webspinners offer insight into convergent evolution of silk use and the variety of ways insects can exploit silk for shelter and survival.